By Nilanjan Chaudhuri, Balarko Chaudhuri, Rajat Majumder, Amirnaser Yazdani
A accomplished modeling, research, and keep watch over layout framework for multi-terminal direct present (MTDC) grids is gifted including their interplay with the encompassing AC networks and the impression on total stability.
• The first ebook of its variety concerning multi-terminal DC (MTDC) grids
• Presents a accomplished modeling framework for MTDC grids that is suitable with the traditional AC procedure modeling for balance studies
• Includes modal research and learn of the interactions among the MTDC grid and the encircling AC systems
• Addresses the issues of self sustaining strength sharing and trade of frequency help throughout a MTDC grid and evaluates their influence on total stability
• Summarizes the cutting-edge, demanding situations and on-going learn and improvement projects for DC fault present interruption
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Extra info for Multi-terminal Direct-Current Grids: Modeling, Analysis, and Control
The tap changing transformers operate to bring the firing angles of the converter stations within the nominal operating range. Following a fault in the DC side, the fault current is extinguished by a technique called forced retard where the rectifier is pushed into the inversion zone. This generates a reverse voltage polarity at the rectifier side and takes the fault energy away from the DC side. LCC converter stations face challenges when connected to weak AC systems due to reasons including high dynamic over voltage, voltage instability, large voltage flicker, and harmonic instability.
Modification of the autonomous power sharing (droop) control to exercise such frequency support across the MTDC grids is described. Toward the end of the monograph, a chapter is dedicated to review of the protection issues of MTDC grids including the RATIONALE BEHIND MTDC GRIDS 5 present state of research in high power DC circuit breakers and fault blocking VSC systems. In addition, the challenges in MTDC grid protection are highlighted along with an overview of some of the protection strategies that could be used in future.
3, a practical VSC employs switching techniques for AC voltage synthesis and, consequently, its AC-side terminal voltage is harmonically distorted. If the Thevenin impedance of the AC grid is small, the voltage harmonics result in large corresponding current harmonics, which do not contribute to the energy transfer process, but stress the VSC (and perhaps even the grid) and decrease the efficiency. Therefore, some impedance must be deliberately inserted between each AC-side terminal of the VSC and the corresponding phase of the AC grid, at the coupling point, to act as a buffer between the VSC and the Thevenin voltage of the AC grid and, thus, ensure an acceptably small current harmonic distortion.